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Div block layout not responsive and design and preview mode look different

Hello guys. I have a problem with the responsivity of my div block elements. On desktop design mode it look good - how i want it to look like - but once I try to resize it in preview mode the whole design breaks. It is not responsive and the spacing between the individual divs is way too much. Plus the divs are out of proportion as well.

Here is my site Read-Only:

Thanks for the help!